33 C.F.R. § 157.45 Valves in cargo or ballast piping system.
Title 33 - Navigation and Navigable Waters
When a tank vessel is at sea and the tanks contain oil, valves and closing devices in the cargo or ballast piping system or in the transfer system must be kept closed except they may be opened for cargo or ballast transfer to trim the vessel.
Title 33: Navigation and Navigable Waters
PART 157—RULES FOR THE PROTECTION OF THE MARINE ENVIRONMENT RELATING TO TANK VESSELS CARRYING OIL IN BULK
Subpart C—Vessel Operation
§ 157.45 Valves in cargo or ballast piping system.
